Motor.



No. 851,632 QPATBNTED APR. 23, 1907. P. SYNNBSTVEDT.

, MOTOR.

APPLICATION FILED MAY 7, 1904.

2-SHEETS-SHEET 1.

WITNESSES; INVENTOR:

PATENTBD APR. 23, 1907.

P. SYNNESTVBDT.

MOTOR.

APPLICATION FILED MAY 7, 1904.

2 SHEETS-SHEET 2 FIG.7.

M W= H H H H M I UNITED STATES PATENT OFFICE.

PAUL SYNNESTVEDT, OF IPITTSBURG, PENNSYLVANIA, ASSIGNOR TO SYh- NESTVEDTMAGHINE COMPANY,

OF I PITTSBURG, PENNSHVANIA, A

CORPORATION OF PENNSYLVANIA.

MOTOR.

Specification. of Letters Patent.

' Patented April 23, 1907.

Application filed May 7,1530% Serial No. 206,857-

understood I will describe the same in (1011-.

nection with the accompanying drawings,

wherein Figure 1 is a view of a wiring diagram showing'the first forwardposition of the mo tor constructed in accordance with my improvement;

Figure 2 shows the second position, Figure 3 the third position, Figure4 the fourth position, and Figures 5 and 6 indicate respectively the 1stand 2nd reverse positions, while Figure 7 is a diagram showing thewiring of the controller and of the motor in case a 4-pole motor isused, all shown together.

Referring now first to Figure 7 it willbe seen that I have thereinindicated a 4-pole motor, which I will mark 8, the poles whereof 8, 8 8and 8 are all provided with coils preferably wound in multiple, that isby two wires Qand 10 taken from different reels and laid on the mold forthe pole coils parallel, that is both laid on it at the same time, asindicated diagrammatically in the drawing, leaving the poles so thateachcoil has four terminals which will give on the l-pole motor shown 16field leads in additionto the two armature leads, which are marked 11and 12. A battery is indicated diagrammatically at 13 and the severalfixed terminals ol the controller are numbered respectively i l to 33inclusive.

The several positions are marked as follows: the first one, forward, 34,the second forward position 35, the thirdiorward 36, and

' the fourth torwardposition' 37, while the first reverse position ismarked 38, and the second reverse position 39.

Considering now the Figures 1 to,6 on the first sheet of the drawings,it will be seen that I have therein indicated the motor 8, the battery13, the brush leads 11 and 12, and

also the .field wiring, the several positions-bemg. showndiagrammatically. From examination of these figures it will appear that,as

indicated in Figure 1, when the controller is in the 1st position,marked 34 on Figure 7, all oithefield winding is in series, althougheach several coil of each pole is wound with double parallel strandolwire. It will further appear, as indicated in Figure 2, that in theQndposition, numbered 35 on Figure 7, the field windings are divided,the parallel strands in each separate field being still in series buttwo and two of the fields being in series multiple as shown. Figure 3indicates the 3rd position, numbered 36 in Figure 7,

which shows all four of the fields in parallel i but the windings oneach coil still in series, while in Figured the four fields are still inparallel but the' windings are also in parallel, the two strands 9 and10 indicated on Figure 7 being companion conductors in the 4th position.

As to the reverse positions indicated in Figures 5and 6, they are thesame as the first two forward positions, except as to the change in thebrush leads necessary to reverse direction of rotation of the motor.

It has been heretofore proposedto construct series motors wherein thewinding of the fields has been commutated to vary the speed of themotor, such winding being in the 1st position all in series thenafterwards either partially cutout or else being so as to be in seriesmultiple and afterwards all of the coils in multiple, and it is theobject of my invention to improve 'on this form of motor construction tosecure, a 4th position in a l-pole motor .or in a motor with windingmaking it the equivalent of a- -l-pole motor in which-4th position thefield windings can be again commutated as shown. to produce a largerconductivity and less-resistance in the fields so as to gain' stillhigher speed in the motor while having all of the current still.traversing the field windings where it will do active work in themagnetization of the field poles.

It is aiurther'obj ect of my inventionto place p1 ,1 r 1, bllv ninoingson t e ielosin su c 1 manner t at when current traverses the same in the4th position the turns of the wire about the poles will all be equallyaffected and will all have equal effect on the poles, that is to say, by

winding the wire on each ole coil in parallel strand and then on the 4t1 position, sending the current through them as parallel conductors,each conductor'has the same relative relation to its pole as the otherof the parallel conductors and therefore bothact similarly and bothcarry their fair and proper share of current, there being no tendency toretard the flow of current more in one than in the other by the actionof the eounter-electro motive force, as would be the case were the coilsWoundseparately and put on one after the other, that is one next thebase and the other near the apex of the pole for example, or one nearerto the pole and the other surrounding that.

Another feature of my improvement to which I desire to call attention isthe disp0- sition of the several contact pieces on the barrel of thecontroller, it being observed that the two battery leads are the extremeoutside leads, numbered respectively 14 and 33, and that the twoarmature leads 1] and 12 are connected respectively with the contacts 32and .31, which are adjacent to the battery contact 33, which leaves allof the fixed terminals, 15 to inclusive, as field terminals whereby, asindicated in the several positions shown in Figure 7 on the barrel ofthe controller, a very simple arrangement of the wiring of said barrelis obtained, the only necessity required in the first position being aseries of double bars as shown in position numbered 34, while in theposition marked there are a series of double bars and single barsconnected as indicated and requiring very little connection betweendifferent parts of the barrel, which simplicity is also observed in thepositions marked 36 and 37. This comparatively simple form of barrelconstruction is obtained, as already indicated, by making the twooutside battery leads on the fixed contacts putting the two brush leadsnext to one of the outside battery leads and making all of the remainderfield leads with the current traveling in rota-- creases thecounter-'electro motive force tends to keep back the battery current sothat/in any position, and particularly in the starting positions, butslight current is necessary and there is no violent jump or heavy strainsuch as is encountered with many of the usual forms of motorconstruction.

Having thus described my invention and illustrated its use, what I claimas new and desire to secure by Letters Patent, is the following: i

1. An improvement in motors comprising a coil composed of sets ofparallel strands for each field pole, means for "conunutatingthe sets ofcoils whereby they are placed in series commutating the windings of eachcoil multiple in the set, substantially as described.

in combination a motor havingwindings on,

in series and multiple, a battery, a controllm'. for said battery andmotor, said controller having its extreme outer fixed contacts connectedwith the battery leads, having the brush leads connected adjacent to oneof said battery contacts and having several connections to each of thefield terminals between said brush leads and said other battery leads,substantially as described.

3. In combination, afour pole motor haw ing eight field windings and acontrolling device therefor adapted l to commutate said windings inseries and series multiple, whereby to secure four speed variationsthere being equal windings on opposite poles, sub-- stantially asdescribed.

4. In combination, a four pole motor having two separate windings toeach pole, and a controlling device therefor adapted to commutate saidwindings in series and series lnultiple, whereby to secure-four speedvariations, substantially as described.

5. In combination, a four pole motor having eight field windings, andmfiansl'or commutating the strands of each. coil, whereby the current iscaused to traversethe windings first in series and then through thewires of each coil in parallel, substantially as described.

In testimony whereof I have hereunder signed my name in the presence ofthe 'two subscribed witnesses;

PAUL SY N NESTVEDT.

Witnesses:

F. W. H. (ILAY,

Guns. H. Ennnr] 2. An improvement in meters comprising the field thereofadapted to be connnutated' and then in parallel, and means for furtherwhereby they are first in series and later in

